[1 Mark Question Answer]

Question 11 Mark

How much time does the bob of a second's pendulum take to move from one extreme of its oscillation to the other extreme?

Answer

Time period of a seconds' pendulum $= 2 s$
Time taken to complete half oscillation, i.e. from one extreme to the other extreme $= 1 s.$

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Question 21 Mark

How are the time period $T$ and frequency $f$ of an oscillation of a simple pendulum related $?$

Answer

Time period of a simple pendulum is inversely proportional to its frequency.
$f=\frac{1}{T}$

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Question 31 Mark

Name two factors on which the time period of a simple pendulum does not depend.

Answer

Two factors on which the time period of a simple pendulum does not depend are
$(i)$ Material of the bob
$(ii)$ Amplitude

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Question 41 Mark

Define the terms : time period as related to a simple pendulum.

Answer

Time period: This is the time taken to complete one oscillation. It is measured in second $(s).$

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Question 51 Mark

Define the term frequency.

Answer

The number of oscillations made in one second is called the frequency. It is denoted by $f$ or $n.$ Its unit is per second $(s^{-1})$ or hertz $(Hz).$

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Question 61 Mark

Define the term amplitude.
What do you understand by amplitude of simple pendulum?

Answer

Amplitude: The maximum displacement of the bob from its mean position on either side is called the amplitude of oscillation. It is measured in metres $(m).$
Amplitude $= AB$ or $AC.$ It is denoted by $‘a’.$

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Question 71 Mark

Define the terms : oscillation
Define the following in connection with a simple pendulum.Oscillation

Answer

Oscillation: One complete to and fro motion of the pendulum is called one oscillation.

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Question 81 Mark

State the numerical value of the frequency of oscillation of a second's pendulum. Does it depend on the amplitude of oscillations?

Answer

The frequency of oscillation of a seconds' pendulum is $0.5 s^{-1}$. It does not depend on the amplitude of oscillation.

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Question 91 Mark

Name the instrument which has the least count
$0.01\ mm$

Answer

Screw gauge

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Question 101 Mark

Name the instrument which has the least count
$1\ mm$

Answer

Metre scale

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Question 111 Mark

Name the instrument which has the least count
$0.1\ mm$

Answer

Vernier callipers

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Question 121 Mark

Which of the following measures a small length to high accuracy : metre rule , vernier callipers or screw gauge?

Answer

Screw gauge measures a length to a high accuracy.

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Question 131 Mark

Name the instrument which can accurately measure the following
The diameter of a pencil.

Answer

Screw gauge

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Question 141 Mark

Name the instrument which can accurately measure the following
The internal diameter of the neck of a water bottle

Answer

Vernier calipers

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Question 151 Mark

Name the instrument which can accurately measure the following
The thickness of a paper

Answer

Screw gauge

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Question 161 Mark

Name the instrument which can accurately measure the following
The diameter of a needle

Answer

Screw gauge

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Question 171 Mark

State the purpose of ratchet in a screw gauge.

Answer

Ratchet helps to advance the screw by turning it until the object is gently held between the stud and spindle of the screw.

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Question 181 Mark

State one use of a screw gauge.

Answer

A screw gauge is used for measuring diameter of circular objects mostly wires with an accuracy of $0.001\ cm.$

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Question 191 Mark

Explain the terms : Pitch .
How are they determined?

Answer

Pitch : The pitch of a screw gauge is the distance moved by the screw along its axis in one complete rotation.

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Question 201 Mark

Name the part of the vernier callipers which is used to measure the following
Thickness of a pencil.

Answer

Outer jaws

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Question 211 Mark

Name the part of the vernier callipers which is used to measure the following
Depth of a small bottle

Answer

Strip

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Question 221 Mark

Name the part of the vernier callipers which is used to measure the following
Internal diameter of a mug

Answer

Inside jaws

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Question 231 Mark

Name the part of the vernier callipers which is used to measure the following
External diameter of a tube

Answer

Outside jaws

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Question 241 Mark

Name the three fundamentals quantities.

Answer

The three fundamentals quantities: Length, Mass, and time.

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Question 251 Mark

What do you understand by the Term Unit?

Answer

The unit is a quantity of constant magnitude which is used to measure the magnitudes of other quantities of the same manner.

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Question 261 Mark

Name the physical quantity related to the following unit:- watt

Answer

Power

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Question 271 Mark

Name the physical quantity related to the following unit: Pascal

Answer

Pressure

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Question 281 Mark

Name the physical quantity related to the following unit :- Joule

Answer

Energy

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Question 291 Mark

Name the physical quantity related to the following unit:-
Newton

Answer

Force

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Question 301 Mark

Name the physical quantity related to the following unit :-
$km^2$

Answer

Area

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Question 311 Mark

How are the following derived unit related to the fundamental unit?
Pascal

Answer

$kg m^{-1}s^{-2}$

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Question 321 Mark

How are the followings derived unit related to the fundamental unit?
joule

Answer

$kg m^2s^{-2}$

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Question 331 Mark

How are the following derived unit related to the fundamental unit?
watt

Answer

$kg m^2s^{-3}$

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Question 341 Mark

How are the following derived unit related to the fundamental unit?
Newton

Answer

$kg ms^{-2}$

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Question 351 Mark

Write the derived unit of the pressure

Answer

$kg m^{-1}s^{-2}$

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Question 361 Mark

Write the derived unit of work

Answer

$kg m^2s^{-2}$

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Question 371 Mark

Write the derived unit of force

Answer

$kg ms^{-2}$

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Question 381 Mark

Write the derived unit of speed

Answer

$ms^{-1}$

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Question 391 Mark

Name the physical quantities which are measured in the given units:
$nm$

Answer

Length

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Question 401 Mark

Name the physical quantities which are measured in the given units:-
$ns$

Answer

Time

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Question 411 Mark

Name the physical quantities which are measured in the given units$:-$
$ly$

Answer

Distance $($or length$)$

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Question 421 Mark

Name the physical quantities which are measured in the given units$: u$

Answer

Mass

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Question 431 Mark

The year $2020$ will have February of $29$ days'. Is this statement true$?$

Answer

Yes, the given statement is true.

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Question 441 Mark

What is a leap year?

Answer

A leap year refers to a year in which February has $29$ days and the total days in the year are $366$ days.

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Question 451 Mark

What is meant by measurement?

Answer

Measurement is the process of comparing a given physical quantity with a known standard quantity of the same nature.

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Question 461 Mark

How is nanometer related to Angstrom?

Answer

$1\ nm = 10\ \mathring A $

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Question 471 Mark

Write the names of two units of length smaller than a metre. Express their relationship with the metre.

Answer

Centimeter $(cm)$ and millimeter $(mm)$ are units of length smaller than a metre.
$1\ cm = 10^{-2}\ m$
$1\ mm = 10^{-3}\ m$

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